Wyldthingz
Savannah Super Cat
I am a firm believer in if you don't need it, don't use it. All those mentioned are safe but still they are chemicals. If you have a flea issue in your area, then use it but if not, use it once in a while, or when you see him scratch. I will go for months without issues. Fleas are very seasonal unless you have them in your carpet or a lot of stray cats.